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server.js
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server.js
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require('dotenv').config();
const express = require("express");
const OpenTok = require("opentok");
const PouchDB = require("pouchdb-node");
const app = express();
const OT = new OpenTok(process.env.API_KEY, process.env.API_SECRET);
const sessionDb = new PouchDB("sessionDb");
sessionDb.info().then(info => console.log(info));
app.use(express.static("public"));
app.use(express.json());
app.get("/", (request, response) => {
response.sendFile(__dirname + "/views/landing.html");
});
app.get("/session/participant/:room", (request, response) => {
response.sendFile(__dirname + "/views/index.html");
});
app.get("/session/viewer/:room", (request, response) => {
response.sendFile(__dirname + "/views/viewer.html");
});
app.get("/messages/:room", (request, response) => {
const roomName = request.params.room;
sessionDb
.get(roomName)
.then(result => {
response.status(200);
response.send({
messagesArray: result.messages
});
})
.catch(error => error);
});
app.post("/session/participant/:room", (request, response) => {
initSession(request, response, "publisher");
});
app.post("/session/viewer/:room", (request, response) => {
initSession(request, response, "subscriber");
});
app.post("/message", (request, response) => {
const roomName = request.body.roomName;
const message = {
timeStamp: request.body._id,
content: request.body.content,
user: request.body.user
};
sessionDb
.get(roomName)
.then(result => {
result.messages = [...result.messages, message];
return sessionDb.put(result);
})
.then(() => {
return sessionDb.get(roomName);
})
.then(result => {
response.status(200);
response.send({
latestMessage: result.messages[result.messages.length - 1]
});
})
.catch(error => console.log("Error adding message: ", error));
});
function checkSession(roomName) {
return sessionDb
.get(roomName)
.then(() => {
console.log(roomName + "exists");
return Promise.resolve(true);
})
.catch(() => {
console.log("Room does not exist");
return Promise.resolve(false);
});
}
function initSession(request, response, userType) {
const roomName = request.params.room;
const streamName = request.body.username;
const isExistingSession = checkSession(roomName);
isExistingSession.then(sessionExists => {
if (sessionExists) {
sessionDb
.get(roomName)
.then(sessionInfo => {
generateToken(roomName, streamName, userType, sessionInfo, response);
})
.catch(error => error);
} else {
OT.createSession((error, session) => {
if (error) {
console.log("Error creating session:", error);
} else {
const sessionInfo = {
_id: roomName,
sessionId: session.sessionId,
messages: []
};
sessionDb.put(sessionInfo);
generateToken(roomName, streamName, userType, sessionInfo, response);
}
});
}
});
}
function generateToken(roomName, streamName, userType, sessionInfo, response) {
const tokenOptions = {
role: userType,
data: `roomname=${roomName}?streamname=${streamName}`
};
let token = OT.generateToken(sessionInfo.sessionId, tokenOptions);
response.status(200);
response.send({
sessionId: sessionInfo.sessionId,
token: token,
apiKey: process.env.API_KEY,
streamName: streamName
});
}
const listener = app.listen(process.env.PORT, () => {
console.log("Your app is listening on port " + listener.address().port);
});